I believe everything is tracked at the folder/file level and not a project level. I'm not sure there even is a concept of a project. But maybe someone can correct me.
There is a concept of a project. Though viewing change history is more organized around packages and files.
History for folders is visible in code search, it’s basically equivalent to what GitHub or Sourcegraph would give you. You can query dependencies from the build system. Anything beyond a couple levels deep is unlikely to load in any tools you have ;)
git log <directory> accomplishes this already.
Google uses piper and perforce (well, g4) before that