title: How can I limit contributors to sub directory of a Github repository
body: <p>We use GitHub to host our private repository. We have multiple contributors who working on the project as contractors.</p>
  
  <p>We want these contributors with limited access to only make changes to a subdirectory within the repository.Additionally, we want these contributors to read the code only within that subdirectory.(in other words anything above the subdirectory is not readable to the contributor. Is there a way to do this on Github? </p>