code: def find_vcs_root(cls, path):
          
          if cls.search_parents_for_root():
              valid_dirs = walk_up_dirs(path)
          else:
              valid_dirs = [path]
          for i, current_path in enumerate(valid_dirs):
              if cls.is_valid_root(current_path):
                  return current_path, i
          return None
docs: Try to find a version control root directory of this type for the
          given path.
  
          If successful, returns (vcs_root, levels_up), where vcs_root is the
          path to the version control root directory it found, and levels_up is an
          integer indicating how many parent directories it had to search through
          to find it, where 0 means it was found in the indicated path, 1 means it
          was found in that path's parent, etc. If not sucessful, returns None