[Samba] inherit permissions doesnt work in 3.0.2a

[Richard Coates]

redhat9, samba 3.0.2a-1 as pdc, wins, xp-pro domain clients, smbpasswd
backend.
all files created get stock 744 perms
directories created in the samba share get 755
I cant seem to over-ride these?
I would like 770
my share definition has..

[share]
path = /mypath
valid users = @staff
writable = yes
inherit permissions = yes

the top level dir is set to 770.
I tried create mask = 770, directory mask = 770 ..no effect.
funny how "inherit perms" worked fine in samba2.2.7
I must be missing something obvious here? please reply as i'm not
currently subscribed. thanks,
Richard.