Check if a map is subset of another map

This question is already answered in many other languages. In golang with simple maps (no nesting) how to find out if a map is subset of another. for example: map[string]string{"a": "b", "e": "f"} is subset of map[string]string{"a": "b", "c": "d", "e": "f"}. I want a generic method. My code:

package main

import (
    "fmt"
    "reflect"
)

func main() {
    a := map[string]string{"a": "b", "c": "d", "e": "f"}
    b := map[string]string{"a": "b", "e": "f"}
    c := IsMapSubset(a, b)
    fmt.Println(c)
}

func IsMapSubset(mapSet interface{}, mapSubset interface{}) bool {

    mapSetValue := reflect.ValueOf(mapSet)
    mapSubsetValue := reflect.ValueOf(mapSubset)

    if mapSetValue.Kind() != reflect.Map || mapSubsetValue.Kind() != reflect.Map {
        return false
    }
    if reflect.TypeOf(mapSetValue) != reflect.TypeOf(mapSubsetValue) {
        return false
    }
    if len(mapSubsetValue.MapKeys()) == 0 {
        return true
    }

    iterMapSubset := mapSubsetValue.MapRange()

    for iterMapSubset.Next() {
        k := iterMapSubset.Key()
        v := iterMapSubset.Value()

        if value := mapSetValue.MapIndex(k); value == nil || v != value { // invalid: value == nil
            return false
        }
    }

    return true
}

When I want to check if subset map key exists in set map, MapIndex returns zero value of type and make it impossible to compare it with anything.

Afterall can I do the same job better?