in src/main/java/org/apache/maven/plugins/clean/Cleaner.java [258:263]
private boolean isSymbolicLink(Path path) throws IOException {
BasicFileAttributes attrs = Files.readAttributes(path, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
return attrs.isSymbolicLink()
// MCLEAN-93: NTFS junctions have isDirectory() and isOther() attributes set
|| (attrs.isDirectory() && attrs.isOther());
}