code: function stripPathPrefix(p, prefix, options) {
    if (!prefix) return p;
    options = _.sanitize(options, {force: false});
    p = _fileCleanPath(p);
    prefix = _fileCleanPath(prefix);
    if (options.force) {
      return path.relative(prefix, p);
    } else {
      const pathSplit = split(p);
      const prefixSplit = split(prefix);
      if (prefixSplit.length > pathSplit.length) return p;
      let i = 0;
      for (i = 0; i < prefixSplit.length; i++) {
        if (pathSplit[i] !== prefixSplit[i]) return p;
      }
      return pathSplit.slice(i).join('/');
    }
  }
docs: Take a path and a prefix and return a relativized version
  @function $file~relativize
  @param {string} path - File path to relativize
  @param {string} prefix - Prefix to remove
  @param {Object} [options]
  @param {boolean} [options.force=false] - Relativize even if the path is not under the prefix
  @returns {string} - The relativized path
  @example
  // Get relative path of 'test' from the '/foo' directory
  $file.relativize('/foo/bar/test', '/foo');
  // => 'bar/test'