如何使用golang从Amazon S3存储桶的子文件夹中获取对象列表？

How do I get the list of objects from a sub folder of an Amazon S3 bucket using golang?

I tried:

svc := s3.New(session.New(), &aws.Config{Region: aws.String("us-east-1")})

params := &s3.ListObjectsInput{
    Bucket: aws.String("bucket"),
}

resp, _ := svc.ListObjects(params)
for _, key := range resp.Contents {
    fmt.Println(*key.Key)
}

I got the list of all the objects in the bucket, but I need only the list of objects in a subfolder.