Process only last filesystem mounted on each mountpoint.

Filesystem                                             Type     1024-blocks     Used Available Capacity Mounted on
rootfs                                                 rootfs       7869660  1608344   5861540      22% /
/dev/disk/by-uuid/4e63f4c3-2841-44d4-8e81-d68b424a596c ext4         7869660  1608344   5861540      22% /
...