code: private void parseMetaZones(JsonObject root) {
      JsonObject node = resolve(root, "supplemental", "metaZones", "metazoneInfo", "timezone");
      for (MetaZone zone : _parseMetaZones(node, Collections.emptyList())) {
        metazones.put(zone.zone, zone);
      }
    }
docs: Parse the metazone mapping from supplemental data.