I just recognized that Mac Os X does not return any millisecond information to java.io.File#lastModified() method.
The long values are rounded, so the most specific kind of information is the second after transfer to a DateTime Object.
Is there a way to get those information some other way, maybe through the java.nio.file.Files#readAttributes(Path,Class,LinkOption[]) method, or want it be possible to distinguish between milliseconds?