x-systemd.automount in a unit file's Options= is only honored when read
from /etc/fstab, so persisted mounts never armed an automount; the unit was
also static (no [Install]) so enable was a no-op. Result: after a reboot the
share sat inactive and the disk never mounted on access.
persist now writes both <name>.mount and <name>.automount units (the
automount with WantedBy=multi-user.target) and enables/starts the automount;
unpersist stops/disables/removes both units.
persist uses x-systemd.automount, so the CIFS share is never actually
mounted until first access and findmnt -t cifs stays empty — list reported
'No SMB mounts' despite configured persistent units. list now also scans
$UNIT_DIR/*.mount for Type=cifs and reports them under 'Persistent
(automount)' (where, what). Empty output still prints 'No SMB mounts'.
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