I can’t seem to find documentation specifying how to make sure that the filter only passes if ALL of the files in the PR follow a certain rule rather than if ANY of the files pass a certain rule.

For example, the following code will trigger if ANY of the files are under [folder], but I’d like it to trigger if ALL of the files are under [folder].

on:
  pull_request:
    paths:
      - "[folder]/**"

Refs: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#patterns-to-match-file-paths

Similar question, but asks about any instead of all: How to run GitHub Actions workflow only if the pushed files are in a specific folder