MacOS how to use standard UNIX behavior for new files

Hi,
I have one problem. then i create new files and folders on my Mac, they get group owner from parant. How can i say to OS that it should get group owner for new files from user GID? same as it works on UNIX/Linux?
How it works on Mac:
MacOS:/ napetrov$ mkdir -p /tmp/new_dir
MacOS:/ napetrov$ id
uid=34148(napetrov) gid=45956(users)
MacOS:/ napetrov$ ls -al /tmp/new_dir
total 0
drwxr-xr-x 2 napetrov wheel 68 Aug 13 19:06 .
drwxrwxrwt 14 root wheel 476 Aug 13 19:06 ..
How it works on linux:
-bash-3.2$ mkdir -p /tmp/new_dir
-bash-3.2$ id
uid=34148(napetrov) gid=45956(users)
-bash-3.2$ ls -al /tmp/new_dir
total 20
drwxr-xr-x 2 napetrov users 4096 Aug 13 19:01 .
drwxrwxrwt 22 root root 12288 Aug 13 19:01 ..
Message was edited by: napetrov

napetrov, there are two varieties of UNIX behavior regarding the group of a newly created file. The first variety, which Linux uses, comes from System V UNIX — where the file is created with the group ID of the creating user. The second variety, which Mac OS X uses, comes from BSD UNIX — where the file is created with the group ID of the directory in which it is located.
In some UNIXes that come with the System V behavior by default, the BSD behavior can be applied to a particular directory by setting the directory‘s “setgid” bit. However, it is rare for a UNIX that comes with the BSD behavior by default to provide a way to allow the System V behavior for a particular user. To my knowledge, Mac OS X does not provide a way to allow the System V behavior for a particular user; thus, I’d recommend the explicit use of chgrp to set the group ID of a newly created file to that of the creating user, if that behavior is what your application needs.

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