How to differentiate access rights to parts of a GIT or Mercurial repository (or multiple repositories)?

Question

git

Good afternoon!
Situation - there is a big c# solution with a bunch of projects inside. Part of the projects is general (CORE), in which everyone makes changes, and several directions in which only the corresponding team sees their projects (tied to CORE).
Plus, there is a team leader who sees and rules everything, and an automaton for the daily build of the entire system.
We decided to switch from svn to git or mercurial. In svn, it was possible to configure access to folders, but I did not find this on these systems.
How to make part of the projects shared, part by commands and shared access to everything by special users?

Answer 1

Look towards gitolite, gitosis or gitlab

Answer 2

the easiest way is to make a repository for each project.