code: func (r *SetattrRequest) Respond(resp *SetattrResponse) {
  	out := &attrOut{
  		outHeader:     outHeader{Unique: uint64(r.ID)},
  		AttrValid:     uint64(resp.AttrValid / time.Second),
  		AttrValidNsec: uint32(resp.AttrValid % time.Second / time.Nanosecond),
  		Attr:          resp.Attr.attr(),
  	}
  	r.Conn.respond(&out.outHeader, unsafe.Sizeof(*out))
  }
docs: // Respond replies to the request with the given response,
  // giving the updated attributes.