Hi,
In conclusion, my CIFS SVM/Volume must join the Active Directory Server. The Clients ans Server which access to the CIFS share could be outside, in WORKGROUP for example.
But what about the post of Aborzenkov :
"As far as I know currently only CIFS servers that a part of Active Directory are supported. Although documentation mentions that "Workgroups are not supported in this release", so it is possible that it will be supported in the future".
Thanks a lot for your answer.