def mkdir(self, path, attr):
return SFTP_OP_UNSUPPORTED<EOL>
Create a new directory with the given attributes.  The ``attr``
object may be considered a "hint" and ignored.

The ``attr`` object will contain only those fields provided by the
client in its request, so you should use ``hasattr`` to check for
the presence of fields before using them.  In some cases, the ``attr``
object may be completely empty.

:param str path:
    requested path (relative or absolute) of the new folder.
:param .SFTPAttributes attr: requested attributes of the new folder.
:return: an SFTP error code `int` like ``SFTP_OK``.