package main

import (
  "fmt"
  "reflect"
)

type Interface interface {
  Method()
}

type Struct struct {
  FieldOne FieldOne
}

type FieldOne struct {
}

func doesFieldImplements(fieldName string) bool {
    var s Struct
    v := reflect.ValueOf(s)
    f := v.FieldByName(fieldName)

    // how to check here if field is valid and it implements the interface Interface
    return false
}


func main() {
  if doesFieldImplements("FieldOne") {
    fmt.Println("implements!")
  }
}

interfaceType := reflect.TypeOf((*Interface)(nil)).Elem()
f.Type().Implements(interfaceType)