private static Set<String> getTopLevelNames(DirectoryNode root) {
        Set<String> names = new HashSet<>();
        for (Entry entry : root) {
            names.add(entry.getName());
        }
        return names;
    }
These are the literal top level names in the root. These are not uppercased
@param root
@return
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/detect/microsoft/POIFSContainerDetector.java