How can my main user access files of sharing only user?

Question

I use network MFD to scan files into shared folders through Samba. Works perfectly fine on Windows: scanner uses its own limited account to access shared folder and store files, but Windows admin user is the owner of this folder and of all of the PDFs in it.
I wanted to setup same system under Mac OS X 10.9.4. I created sharing only user "scanner" for my network MFD to access shared "Scan" folder on my MacBook Air through Samba. I shared this "Scan" folder for both my main MacBook user and "scanner" user with read/write permissions. Now if my network scanner logs on to the shared folder with username/password of my main user (and I consider this insecure and wrong) - everything works fine. But if network scanner uses its special "scanner" account, it creates file which I can't open later with my main MacBook user ("scanner" is the owner of this file, and "main" doesn't have permission even to read the file).
Looks like newly created files in shared folder don't inherit permissions of the folder.
Is there a way to force my main MacBook account to be owner of all files created by "scanner" account (at least in one folder used for scan results)?

Answer 1

Create a “scannergroup” group in Users & Groups. It’s the same process as for a user, but change the type to Group. Add all of your real users and your scanner user to the group.
Open Terminal and copy/paste this command into the terminal window. If you want to use different names for the Group or the folder, edit the line in a text editor, then copy/paste it into Terminal.
sudo chmod -R +a "scannergroup allow delete,chown,list,search,add_file,add_subdirectory,delete_child,file_inherit,directory_inherit" /Users/Shared/Scan
To change the group name in the command, change scannergroup to whatever you create in Users & Groups.
To change the folder, change the full path as shown by /Users/Shared/Scan
That command creates an Access Control List entry that allows each member of the scannergroup to read/write/delete/ items created by others in the group.