Branches that will remain:
  local branches:
    master
  remote references:
    origin/HEAD
    origin/master
    git@github.com:someone/fork, refs/heads/some-branch [merged, but: filtered]

Delete merged local branches:
  - some-branch
Confirm? [y/N]

Branches that will remain:
  local branches:
    master
    some-branch [diverged with git@github.com:someone/fork, refs/heads/some-branch, but: filtered]
  remote references:
    origin/HEAD
    origin/master
    git@github.com:someone/fork, refs/heads/some-branch [diverged with some-branch, but: filtered]