[Swift] How to get the document ID of Firebase

var documentId : String?

self.firestore.collection("users").document("samplesample")
            .getDocuments() { (querySnapshot, err) in
                if let err = err {
                    print("Error getting documents: \(err)")
                } else {
                     for document in querySnapshot!.documents {

                         self.documentId = document.documentID
                     }
                  }
              }

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