[Samba] subshares ?

[ipguy]

hi all...
i have what seems a simple question regarding subshares, for lack of a better term...
say i have a share with specific user/group permissions and a directory inside the share that i would like to add different user/group permissions...
this is an example of my smb.conf file to illustrate

[driveA]
path = /samba/driveA
browseable = Yes
writeable = Yes
valid users = PDC+groupA
force group = PDC+groupA

[driveB]
path = /samba/driveA/driveB
browseable = No
writeable = Yes
valid users = PDC+groupB
force group = PDC+groupB
inherit permissions = No

shouldn't this restrict groupA users from accessing the subshare called "driveB" located inside the share "/samba/driveA" ??