code: func (f *FilterOp) And(filters ...*FilterOp) *FilterOp {
  	if len(f.AndFilters) == 0 {
  		f.AndFilters = filters[:]
  	} else {
  		f.AndFilters = append(f.AndFilters, filters...)
  	}
  
  	return f
  }
docs: // And will add an AND op to the filter. One or more FilterOps can be passed in.