docs: public static final String getStringAttribute(Path path, String attribute, LinkOption... options) throws IOException
      {
          attribute = attribute.startsWith("user:") ? attribute : "user:"+attribute;
          byte[] attr = (byte[]) Files.getAttribute(path, attribute, options);
          if (attr == null)
          {
              return null;
          }      
          return new String(attr, UTF_8);
      }