docs: def file_path(self, depth=1, category=None, extension=None):
          """
          :param category: audio|image|office|text|video
          :param extension: file extension
          :param depth: depth of the file (depth >= 0)
          """
          file = self.file_name(category, extension)
          path = "/{0}".format(file)
          for _ in range(0, depth):
              path = "/{0}{1}".format(self.generator.word(), path)
          return path