I have setup a Samba share on Ubuntu 12.04 for our finance team, and they access it via Windows 7 and Mac OS X. They mount the share using their LDAP credentials. All of our LDAP users have "employees" as their primary group, and the finance team belongs to a secondary group named "finance".
When any of the finance team members create a folder within the Samba share, the folder's group defaults to "employees". How can I force all files and folders created on the share to have the group set to "finance"?