public static IMultiFileSystemChangeFilter ToMultiFileSystemChangeFilter(this IEnumerable<SyncFolder> syncFolders, IChangeFilterFactory filterFactory)
        {
            var tuples = from syncFolder in syncFolders
                let filter = filterFactory.GetFilter(syncFolder.Filter)
                select new Tuple<string, IChangeFilter>(syncFolder.Name, filter);

            return new MultiFileSystemChangeFilter(tuples);

        }