If you have a shell that supports extended globbing, you could do something like:
$ git who table */**/*.go
That works for me using Bash. I believe all that's happening here is that Bash is expanding the globs and passing a long list of individual filepaths as arguments to git who. Git who then passes them to git log so that it only tallies the commits you'd get by running:
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Not sure what's happening with the tarball. Will take a look at that.