code: function processAttachmentNode(node, options) {
      options = options || {};
  
      var data = [].concat(getBasicFields(node, options));
  
      if (!options.body) {
          data = data.concat(getExtensionFields(node, options));
      }
  
      data.node = node;
      return data;
  }
docs: Processes a non-text, non-multipart node
  
  @param {Object} node A tree node of the parsed mime tree
  @param {Object} [options] Optional options object (see createBodystructure for details)
  @return {Array} BODYSTRUCTURE for the part