samba - Jul 1998 - Dont understand Samba permissions.

Hej SAMBA users:
     
     I don't understand the way samba makes the file and dir permissions. 
     Normally a a file inherits the permissions from the directory, from 
     within it is created. In SAMBA you setup a mask for file and directory 
     creating, with is used all over the share. If you a directory within 
     the share with drwxrws--- set, and create a file, in that dir, it will 
     not have the same permissions, but use the permissions you have stated 
     in your mask:
     
     root@hpcs7:/web/edb-docs/hpcs7_root/serverview #ls -ld .
     drwxrws---   2 tmh        admweb        4096 Jul 14 14:43 .
     
     New file from samba:
     
     -rwxr-x---   2 tmh        a9544        200 Jul 14 14:43 juhu
     
     New file from unix:
     
     -rwxrwx---   2 tmh        admweb        300 Jul 14 14:43 file
     
     
     Could any tell me why? Do anyone know if it will changed, so a file 
     can inherit the permissions from the parent dir?
     
     
     Thomas