Parse a dict of features from FTP feat response.

def _parse_features(cls, feat_response):
        # type: (Text) -> Dict[Text, Text]
        """Parse a dict of features from FTP feat response.
        """
        features = {}
        if feat_response.split("-")[0] == "211":
            for line in feat_response.splitlines():
                if line.startswith(" "):
                    key, _, value = line[1:].partition(" ")
                    features[key] = value
        return features