Export the contents of the container's filesystem as a tar archive.

        Args:
            chunk_size (int): The number of bytes returned by each iteration
                of the generator. If ``None``, data will be streamed as it is
                received. Default: 2 MB

        Returns:
            (str): The filesystem tar archive

        Raises:
            :py:class:`docker.errors.APIError`
                If the server returns an error.

def export(self, chunk_size=DEFAULT_DATA_CHUNK_SIZE):
        """
        Export the contents of the container's filesystem as a tar archive.

        Args:
            chunk_size (int): The number of bytes returned by each iteration
                of the generator. If ``None``, data will be streamed as it is
                received. Default: 2 MB

        Returns:
            (str): The filesystem tar archive

        Raises:
            :py:class:`docker.errors.APIError`
                If the server returns an error.
        """
        return self.client.api.export(self.id, chunk_size)