Remove refs/original/heads/master from git repo after filter-branch --tree-filter?

Question

I had the same question as asked here: New git repository in root directory to subsume an exist repository in a sub-directory

I followed this answer here: New git re

Answer 1

filter-branch keeps backups so repository need to clean up reflogs and garbage collect. Make sure that have no need in this backups before deletion:

rm -Rf .git/refs/original
git gc --aggressive --prune=now