[Huawei Mate 9 Questions & Answers] 5[Strogino]:
Output after mount:

System ext4

Data f2fs

rootfs on / type rootfs (ro,seclabel,size=1787504k,nr_inodes=446876)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=1874928k,nr_inodes=468732,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
none on /acct type cgroup (rw,relatime,cpuacct)
tmpfs on /mnt type tmpfs (rw,seclabel,relatime,size=1874928k,nr_inodes=468732,mode=755,gid=1000)
none on /config type configfs (rw,relatime)
none on /dev/cpuctl type cgroup (rw,relatime,cpu)
none on /dev/cpuset type cgroup (rw,relatime,cpuset,blkio,cpuset_noprefix)
pstore on /sys/fs/pstore type pstore (rw,seclabel,relatime)
/dev/block/bootdevice/by-name/secure_storage on /sec_storage type ext4 (rw,context=u:object_r:teecd_data_file:s0,nosuid,nodev,noatime,discard,noauto_da_alloc,data=ordered)
none on /dev/frz type cgroup (rw,relatime,freezer)
none on /sys/fs/cgroup type tmpfs (rw,seclabel,relatime,size=1874928k,nr_inodes=468732,mode=750,gid=1000)
none on /sys/fs/cgroup/pids type cgroup (rw,relatime,pids)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
hdb on /dev/usb-ffs/hdb type functionfs (rw,relatime)
/dev/block/dm-0 on /system type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/bootdevice/by-name/splash2 on /splash2 type ext4 (rw,context=u:object_r:splash2_data_file:s0,nosuid,nodev,noatime,data=ordered)
/dev/block/dm-1 on /vendor type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/dm-2 on /product type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/dm-3 on /version type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/dm-4 on /cust type ext4 (ro,seclabel,relatime,data=ordered)
/dev/block/bootdevice/by-name/userdata on /data type f2fs (rw,seclabel,nosuid,nodev,noatime,background_gc=on,discard,user_xattr,inline_xattr,acl,inline_data,extent_cache,inline_encrypt,active_logs=6)
/dev/block/bootdevice/by-name/cache on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/bootdevice/by-name/hisee_fs on /hisee_fs type ext4 (ro,context=u:object_r:hisee_data_file:s0,relatime,data=ordered)
/dev/block/bootdevice/by-name/modem_secure on /modem_secure type ext4 (rw,context=u:object_r:modem_secure_file:s0,relatime,noauto_da_alloc,data=ordered)
/dev/block/bootdevice/by-name/modem_fw on /modem_fw type ext4 (ro,context=u:object_r:modem_fw_file:s0,relatime,data=ordered)
/dev/block/bootdevice/by-name/modemnvm_img on /mnvm2:0 type ext4 (rw,context=u:object_r:modem_nv_file:s0,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
/dev/block/bootdevice/by-name/modem_om on /modem_log type ext4 (rw,context=u:object_r:modem_log_file:s0,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
tmpfs on /storage type tmpfs (rw,seclabel,relatime,size=1874928k,nr_inodes=468732,mode=755,gid=1000)
/sys/kernel/debug on /sys/kernel/debug type debugfs (rw,seclabel,relatime,gid=1000,mode=775)
tracefs on /sys/kernel/debug/tracing type tracefs (rw,relatime)
/data/media on /mnt/runtime/default/emulated type sdcardfs (rw,nosuid,nodev,relatime,uid=1023,gid=1023,derive=legacy,reserved=20MB)
/data/media on /storage/emulated type sdcardfs (rw,nosuid,nodev,relatime,uid=1023,gid=1023,derive=legacy,reserved=20MB)
/data/media on /mnt/runtime/read/emulated type sdcardfs (rw,nosuid,nodev,relatime,uid=1023,gid=1023,derive=legacy,reserved=20MB)
/data/media on /mnt/runtime/write/emulated type sdcardfs (rw,nosuid,nodev,relatime,uid=1023,gid=1023,derive=legacy,reserved=20MB)