samba - Sep 2012 - How to set the parameter for smbclient4 -m xxx

Dear everybody,

I run ./smbclient4 -m 2 //server/share, trying to use SMB2 dialect, but
failed here.
Can somebody told me what is the right parameter value?
By the way, could anybody tell me the steps to write and run a new test
suite like SMB-BASIC.

Thanks

Jun