[Xiaomi Poco F1 Questions & Answers] Lonesome Walker:
I pulled fstab from phone:

twrp.fstab

# Android fstab file.
# The filesystem that contains the filesystem checker binary (typically /system) cannot
# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK

# mount point type device device2 flags

/boot emmc /dev/block/bootdevice/by-name/boot flags=display="Boot"
/cache ext4 /dev/block/bootdevice/by-name/cache
/recovery emmc /dev/block/bootdevice/by-name/recovery flags=display="Recovery";backup=1

/system ext4 /dev/block/bootdevice/by-name/system flags=backup=1;wipeingui;display="System"
/vendor ext4 /dev/block/bootdevice/by-name/vendor flags=backup=1;wipeingui;display="Vendor"

/system_image emmc /dev/block/bootdevice/by-name/system flags=backup=1;flashimg=1
/vendor_image emmc /dev/block/bootdevice/by-name/vendor flags=backup=1;flashimg=1

/data ext4 /dev/block/bootdevice/by-name/userdata flags=encryptable=footer;length=-16384;fileencryption=ice:aes-256-cts:aes-256-heh
/firmware vfat /dev/block/bootdevice/by-name/modem flags=display="Firmware";mounttodecrypt
/cust ext4 /dev/block/bootdevice/by-name/cust flags=display="Cust"
/misc emmc /dev/block/bootdevice/by-name/misc
/modem emmc /dev/block/bootdevice/by-name/modem flags=backup=1;display="Modem"
/bluetooth emmc /dev/block/bootdevice/by-name/bluetooth flags=backup=1;subpartitionof=/modem
/dsp emmc /dev/block/bootdevice/by-name/dsp flags=backup=1;subpartitionof=/modem
/efs1 emmc /dev/block/bootdevice/by-name/modemst1 flags=backup=1;display=EFS
/efs2 emmc /dev/block/bootdevice/by-name/modemst2 flags=backup=1;subpartitionof=/efs1
/efsc emmc /dev/block/bootdevice/by-name/fsc flags=backup=1;subpartitionof=/efs1
/efsg emmc /dev/block/bootdevice/by-name/fsg flags=backup=1;subpartitionof=/efs1
/persist ext4 /dev/block/bootdevice/by-name/persist flags=display="Persist"
/storage ext4 /data/media/0 flags=display="Internal Storage";usermrf;backup=1;fsflags="bind";removable

# Removable storage
/usb_otg vfat /dev/block/sdg1 /dev/block/sdg flags=display="USB-OTG";storage;wipeingui;removable
/external_sd vfat /dev/block/mmcblk0p1 /dev/block/mmcblk0 flags=display="MicroSD Card";storage;wipeingui;removable

recovery.fstab

# Android fstab file.
# The filesystem that contains the filesystem e2fsck binary (typically /system) cannot
# specify 'check', and must come before any filesystems that do specify 'check'

# NOTE: /system and /vendor partitions are early-mounted and the fstab entry is specified in device tree (duplicated below for recovery image purposes only):
# /proc/device-tree/firmware/android/fstab/system
# /proc/device-tree/firmware/android/fstab/vendor

#<src> <mnt_point> <type> <mnt_flags and options> <fs_mgr_flags>
/dev/block/bootdevice/by-name/userdata /data ext4 noatime,nosuid,nodev,barrier=0,noauto_da_alloc latemount,wait,check,fileencryption=ice,quota,encryptable=footer
/dev/block/bootdevice/by-name/modem /vendor/firmware_mnt vfat ro,shortname=lower,uid=0,gid=1000,dmask=227,fmask=337,context=u:object_r:firmware_file:s0 wait
/dev/block/bootdevice/by-name/dsp /vendor/dsp ext4 ro,nosuid,nodev,barrier=1 wait
/dev/block/bootdevice/by-name/persist /mnt/vendor/persist ext4 noatime,nosuid,nodev,barrier=1 wait
/dev/block/bootdevice/by-name/bluetooth /vendor/bt_firmware vfat ro,shortname=lower,uid=1002,gid=3002,dmask=227,fmask=337,context=u:object_r:bt_firmware_file:s0 wait
/dev/block/bootdevice/by-name/cache /cache ext4 noatime,nosuid,nodev,barrier=1 wait
/dev/block/bootdevice/by-name/misc /misc emmc defaults defaults
/dev/block/bootdevice/by-name/boot /boot emmc defaults recoveryonly
/dev/block/bootdevice/by-name/recovery /recovery emmc defaults recoveryonly
/dev/block/bootdevice/by-name/system /system ext4 ro,barrier=1 wait,recoveryonly
/dev/block/bootdevice/by-name/vendor /vendor ext4 ro,barrier=1 wait,recoveryonly

/devices/platform/soc/8804000.sdhci/mmc_host* /storage/sdcard1 vfat nosuid,nodev wait,voldmanaged=sdcard1:auto,encryptable=footer

/devices/platform/soc/a600000.ssusb/a600000.dwc3/xhci-hcd.0.auto* /storage/usbotg vfat nosuid,nodev wait,voldmanaged=usbotg:auto

and the regular fstab

/dev/block/sda20 /cache ext4 rw 0 0
/dev/block/sde48 /system_root ext4 ro 0 0
/dev/block/sde47 /vendor ext4 ro 0 0
/dev/block/sda21 /data ext4 rw 0 0
/dev/block/sde46 /firmware vfat rw 0 0
/dev/block/sda18 /cust ext4 rw 0 0
/dev/block/sda14 /persist ext4 rw 0 0
/storage ext4 rw 0 0
/usb_otg vfat rw 0 0
/external_sd vfat rw 0 0