find value in nested map

func (m map[string]interface{}, path string) interface{} {
    keys := strings.Split(path, ".")
    if len(keys) > 1 {
        v := m[keys[0]]
        v1, ok := v.(map[string]interface{})
        if !ok {
            return nil
        }
        return FindValue(v1, strings.Join(keys[1:], "."))
    }
    return m[keys[0]]
}