code: func (p *pathObject) SaveInPredicates(tag string) *pathObject {
  	np := p.clonePath().SavePredicates(true, tag)
  	return p.new(np)
  }
docs: // SaveInPredicates tags the list of predicates that are pointing in to a node.
  //
  // Example:
  // 	// javascript
  //	// bob only has "<follows>" predicates pointing inward
  //	// returns {"id":"<bob>", "pred":"<follows>"}
  //	g.V("<bob>").SaveInPredicates("pred").All()