Whether Git supports directory level access or not?

Hi,

Please let me know whether Git supports directory level access or not.

For example :- Consider the structure with one repository consisting of 
sub directories for each product.
main_repo:
    dir1 dir
    dir2 dir
    shared-dir dir
    private dir
One group(user) of developers has access to dir1 and shared-dir while 
the other group(user) has access to dir2 and shared-resources.
Just for context, both dir1 and dir2 require shared-dir to be checked 
out for building the products.

And private dir is only accessible by admin(repo owner).

Regards Saurabh gaur