SilcSFTP silc_sftp_server_start(SilcStream stream,
                                    SilcSchedule schedule,
                                    SilcSFTPErrorCallback error_cb,
                                    void *context,
                                    SilcSFTPFilesystem fs);

    Starts SFTP server and returns a context to it.  This function returns
    the allocated SFTP server context or NULL on error.  The `stream' is
    the stream (connection) to the client.  The `error_cb' will be called
    when the `stream' is ended (SILC_SFTP_STATUS_EOF).  The caller is
    responsible of closing and destroying the `stream'.  The `fs' is the
    filesystem context allocated by the application.