docs: public long getLastModified( DirectoryEntry entry )
          throws IOException
      {
          long lastModified = 0;
          for ( FileSystem delegate : delegates )
          {
              try
              {
                  lastModified = Math.max( lastModified, delegate.getLastModified( entry ) );
              }
              catch ( IOException e )
              {
                  // ignore
              }
          }
          return lastModified;
      }