I suppose it depends on how the claim is formulated? Take the CraftBukkit[1] claim for example. In that case, all commits since a specific point, plus all forks, were taken down:

"Pages including infringing content: [...] infringing as of commit [...] and every subsequent commit, including all forks that contain this commit [...] and all forks that share a common first commit [...] and every subsequent commit, including all forks that contain this commit"

This made any effort for restoration futile, since most of the repo was being claimed.

[1] https://github.com/github/dmca/blob/master/2014/2014-09-05-C...