listGroupsForUser   
  inline suspend fun IamClient.listGroupsForUser(crossinline block: ListGroupsForUserRequest.Builder.() -> Unit): ListGroupsForUserResponse
Lists the IAM groups that the specified IAM user belongs to.
You can paginate the results using the MaxItems and Marker parameters.
Samples
fun main() { 
   //sampleStart 
   // The following command displays the groups that the IAM user named Bob belongs to.
val resp = iamClient.listGroupsForUser {
    userName = "Bob"
} 
   //sampleEnd
}