How to split a git repository while preserving subdirectories?

Question

What I want is similar to this question. However, I want the directory that is split into a separate repo to remain a subdirectory in that repo:

I have this:

Answer 1

Use git-filter-repo This is not part of git as of version 2.25. This requires Python3 (>=3.5) and git 2.22.0

mkdir new_repoA
mkdir new_repoB
git clone originalRepo newRepoA
git clone originalRepo newRepoB

pushd
cd new_repoA
git filter-repo --path foo/bar --path foo/baz

popd
cd new_repoB 
git filter-repo --path foo/qux

For my repo that contained ~12000 commits git-filter-branch took more than 24 hours and git-filter-repo took less than a minute.