Comment # 9 on bug 1137390 from Jason Mader

(In reply to Neil Brown from comment #8)

> Next question, what does
>   systemctl show mnt.mount
> show. I'm particularly looking for a "RequiredBy" line or maybe "WantedBy"

# systemctl show mnt.mount | egrep 'RequiredBy|WantedBy'
RequiredBy=mnt-tahan.mount mnt-tahan-01_RSH.mount

> Also, please see if 
>    systemctl show '*' | grep RequiresMountsFor=/mnt
> finds any matches.

# systemctl show '*' | grep RequiresMountsFor=/mnt
RequiresMountsFor=/mnt/tahan
RequiresMountsFor=/mnt

I thought the Options= line in /run/systemd/generator/mnt.mount was weird with
a 'fg' and 'bg'

Options=x-systemd.mount-timeout=infinity,retry=10000,noauto,bg,nodev,nosuid,proto=tcp6,vers=4.1,fg

Even though the /etc/fstab entry is 'bg' only.