_findmnt --real
TARGET SOURCE FSTYPE OPTIONS
/ /dev/sda3 btrfs rw,relatime,ssd,space_cache=v2,subvolid=5,subvol=/
├─/run/user/1000/doc
│ portal fuse.port rw,nosuid,nodev,relatime,user_id=1000,group_id=984
├─/boot /dev/sda1 vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mix
└─/home /dev/sda4 btrfs rw,relatime,ssd,space_cache=v2,subvolid=5,subvol=/_