MariaDB [test]> create table tc (t timestamp(6)) engine=CONNECT table_type=DOS file_name='tc.file';

Query OK, 0 rows affected (0.03 sec)

MariaDB [test]> insert into tc values ('2012-12-12 12:12:12.123456');

Query OK, 1 row affected (0.01 sec)

MariaDB [test]> select * from tc;

+----------------------------+

| t                          |

+----------------------------+

| 2012-12-12 12:12:12.000000 |

+----------------------------+

1 row in set (0.00 sec)

$ cat data/test/tc.file

 1355307132