'Return true if the specified file is a gpfs clone parent.'

def _is_gpfs_parent_file(self, gpfs_file):

    (out, err) = self.gpfs_execute((self.GPFS_PATH + 'mmclone'), 'show', gpfs_file)
    ptoken = out.splitlines().pop().split()[0]
    return (ptoken == 'yes')
