Setting NFS export SGID

Hi there ..

Can anybody advise me if I can set SGID on NFS export ?

I have mounted DD FS and set SGID for that directry ,,, but SGID seems not working under that directry .

If directry tori has SGID as aya , New directry unser /tori/roti1 also has SGID as aya . But its show up as root.

While if I set in local directry in my Linux host ... SGID will be show up...

sakana directry has SGID as aya2 , then new directry created under /sakana/sakana2 has SGID as aya2 . ( that is supposed to be ..)

How can I set NFS export user SGID to be work ... is there any tips when I set export in DD ? ( GUI seems to be not much option .. )

thanks！