<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_document_path(client, path):
 """Convert a path tuple into a full path string. Of the form: documents/{document_path}`` Args: client (~.firestore_v1beta1.client.Client):
 The client that holds configuration details and a GAPIC client object. Returns: str: The fully-qualified document path. """

    parts = (client._database_string, "documents") + path
    return _helpers.DOCUMENT_PATH_DELIMITER.join(parts)