Increments the shadow count on mount. Usually used by
#GVolumeMonitor implementations when creating a shadow mount for
mount, see gio.mount.Mount.isShadowed for more information. The caller
will need to emit the #GMount::changed signal on mount manually.
Increments the shadow count on mount. Usually used by #GVolumeMonitor implementations when creating a shadow mount for mount, see gio.mount.Mount.isShadowed for more information. The caller will need to emit the #GMount::changed signal on mount manually.