'Check if a volume is the snapshot source
:param volume_path: path of the volume
:param snap_name: name of the snapshot
:param fs_label: filesystem label
:return: True if the volume is the snapshot\'s source or False otherwise'

def check_snapshot_parent(self, volume_path, snap_name, fs_label):

    lines = self.get_cloned_file_relatives(volume_path, fs_label, True)
    for line in lines:
        if (snap_name in line):
            LOG.debug('Snapshot    %(snap)s    found    in    children    list    from    %(vol)s!', {'snap': snap_name, 'vol': volume_path})
            return True
    LOG.debug('Snapshot    %(snap)s    was    not    found    in    children    list    from    %(vol)s,    probably    it    is    not    the    parent!', {'snap': snap_name, 'vol': volume_path})
    return False
