findEnclosingMount
Gets a #GMount for the #GFile.
#GMount is returned only for user interesting locations, see #GVolumeMonitor. If the #GFileIface for @file does not have a #mount,
Return
a #GMount where the @file is located or null on error. Free the returned object with g_object_unref().
Parameters
cancellable
optional #GCancellable object, null to ignore