[Unit]
Description=Mnt Directory (/mnt)
DefaultDependencies=no
Conflicts=umount.target
Wants=mask-local-mnt.service
Before=local-fs.target umount.target mask-local-mnt.service
RequiresMountsFor=/local

[Mount]
What=/local/mnt
Where=/mnt
Type=none
Options=rbind,rshared

[Install]
WantedBy=local-fs.target