public UnixMountEntry (string mount_path, out uint64 time_read = null)
Gets a UnixMountEntry for a given mount path.
time_read is set, it will be filled with a unix timestamp for checking if the mounts have changed since with
If more mounts have the same mount path, the last matching mount is returned.
This will return null if there is no mount point at
path for a possible unix mount.
guint64 to contain a timestamp.