How to config namespace for 'private' branches in git?

Is it possible to config git repository not to fetch branches from certain namespaces of the origin repository by default?

What I want is to put my current work in some namespace so that everyone else know it is not ready yet. For example, if I config namespace a like that:

[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    fetch = +r开发者_如何学编程efs/heads/a/*:refs/remotes/origin/a/*
    push = +refs/heads/a/*:refs/heads/a/*
    url = some_git_url

Others would have fetch = +refs/heads/*:refs/remotes/origin/* line but not fetch = +refs/heads/a/*:refs/remotes/origin/a/*. Of course they can fetch branch from my /a/ namespace. But I want that not to happen by default so that my working commits don't clutter others' history graphs.

The problem is that it seems refs/heads/* includes nested namespaces. So when I do git fetch on any machine - I still get everything from /a/ namespace.

Is there a way to config git like I want? To tell git to fetch only immediate branches from refs/heads/?

Keep your working branches locally and only push the shared branches. Ask others to do the same.

That's assuming you're all sharing a central repository as a remote, rather than pushing/pulling to and from each other's local repositories.