I just created a share called documents, totally expecting the usual folders: cgi-bin,files,html.
Since I did not need this to act as a development domain (I always name my dev projects *.dev and enable dynamic content, accessible to the entire internet, etc.) I did not make it accessible to the entire internet.
Set this: Public access via web or anonymous ftp: to NONE
You have what you want - if I understand you correctly.
Cheers