How to organize access restriction for a part of the code in the repository for remote work?

Question

Distant work

There is a large project with many modules. There is only one git repository.
How can I limit the access of the remoter so that it works with the code of only one module? What is the main requirement - the inability to view the code from another module.
php language.
So far, I see only one way out - the division of the project into services. Each with its own repository.

Answer 1

dig towards the gitolite