code: def layers(self):
          
          # sample output:
          # {
          #     "Created": 1457116802,
          #     "Id": "sha256:507cb13a216097710f0d234668bf64a4c92949c573ba15eba13d05aad392fe04",
          #     "Size": 204692029,
          #     "Tags": [
          #         "docker.io/fedora:latest"
          #     ],
          #     "Comment": "",
          #     "CreatedBy": "/bin/sh -c #(nop) ADD file:bcb5e5c... in /"
          # }
          try:
              response = self.d.history(self.image_id)
          except docker.errors.NotFound:
              raise NotAvailableAnymore()
  
          layers = []
          for l in response:
              layer_id = l["Id"]
              if layer_id == "<missing>":
                  layers.append(DockerImage(l, self.docker_backend))
              else:
                  layers.append(self.docker_backend.get_image_by_id(layer_id))
          return layers
docs: similar as parent images, except that it uses /history API endpoint
          :return: