code: public DirectoryStream<Path> newDirectoryStream(Path dir)
      {
          try {
              return new WrappingDirectoryStream(Files.newDirectoryStream(dir));
          } catch (IOException e) {
              return null;
          }
      }
docs: See {@link Files#newDirectoryStream(Path)}.
  <p>
  Velocity Example:
  <pre>{@code
  #set ($dirStream = $niotool.newDirectoryStream("attach:Sandbox.WebHome@vma.txt.zip/"))
  #foreach ($entry in $dirStream)
  * {{{$entry}}}
  #end
  }</pre>
  
  @param dir See {@link Files#newDirectoryStream(Path)}
  @return See {@link Files#newDirectoryStream(Path)}