'Returns two FS for source and destination paths respectively.
If `dst` is not self-contained path assumes it\'s relative path to `src`.'

def _get_fs_pair(self, src, dst):

    src_fs = self._get_fs(src)
    dst_scheme = self._get_scheme(dst)
    if (not dst_scheme):
        return (src_fs, src_fs)
    return (src_fs, self._get_fs(dst))
