NTFS permissions - how to list changed ones?

I need to take a snapshot of ntfs permissions on one PC. It behaves as a file server in a workgroup environment. All folders on this PC are shared, and I have gathered all the information about share permissions. Now I need to gather all the ntfs permissions, but I dont want to list the defailt ones, only the ones that were changed.

For example, when sharing a folder, this folder is assigned default ntfs permissions (Adminstrators, Creator Ownder, Users, Everyone, etc). I am not interested in gathering ntfs permissions for this folder, since they are default. However, if I added a particular user to this user list, or removed a user/group, then this folder becomes of interest.

Is this possible, and if it is, then how? I dont want to loop through all files/folders and look for the changed ones,, it will take a lot of time and is prone to errors.

Thanks,
Goran