Autodetect attempts to parse.

https://www.man7.org/linux/man-pages/man7/cgroups.7.html 5:cpuacct,cpu,cpuset:/daemons (1) (2) (3) (1) hierarchy ID: cgroups version 1 hierarchies, this field contains a unique hierarchy ID number that can be matched to a hierarchy ID in /proc/cgroups.

https://www.man7.org/linux/man-pages/man5/proc_pid_mountinfo.5.html 731 771 0:59 /sysrq-trigger /proc/sysrq-trigger ro,nosuid,nodev,noexec,relatime - proc proc rw 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue (1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11) (1) mount ID: a unique ID for the mount (may be reused after umount(2)).