[go-nuts] reflect and interface

I have some predefined struct (with json tags), that i need to expose
in http via http.FileSystem.
I'm already implement needed functions, but stuck when i need somethins like:
/first/second/third/

in this case i need to get element with name fist, return it value and
recursive go to the last object.
Does it possible?

I have ugly code that not works as needed:

        for _, name := range strings.Split(f.name, "/") {
                 val := reflect.ValueOf(data)
                 for i := 0; i < val.NumField(); i++ {
                         valueField := val.Field(i)
                         typeField := val.Type().Field(i)
                         tag := typeField.Tag
                         if tag.Get("json") == name &&
!strings.HasSuffix(f.name, name) {
                                 data = valueField.Interface()
                                 continue nameLoop
                         }
                         if strings.HasSuffix(f.name, "/") {
                                 buffer = append(buffer,
[]byte(fmt.Sprintf("%s\n", tag.Get("json")))...)
                         } else {
                                 buffer = append(buffer,
[]byte(fmt.Sprintf("%v\n", valueField.Interface()))...)
                         }
                 }
         }

does somebody knows how to do that i need ?+0 or already have needed code?