@Override
            public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) {
                if (matcher.matches(file)) {
                    result.add(file);
                }
                return FileVisitResult.CONTINUE;
            }
Gets all files associated with a parent.
stroom-data/stroom-data-store-impl-fs/src/main/java/stroom/data/store/impl/fs/FsPathHelper.java