minikube delete does not delete volumes of worker nodes in multinode

[sharifelgamal]

$ out/minikube start --driver=docker
😄  minikube v1.10.1 on Darwin 10.15.4
✨  Using the docker driver based on user configuration
👍  Starting control plane node minikube in cluster minikube
🔥  Creating docker container (CPUs=2, Memory=1991MB) ...
🐳  Preparing Kubernetes v1.18.2 on Docker 19.03.2 ...
    ▪ kubeadm.pod-network-cidr=10.244.0.0/16
🔎  Verifying Kubernetes components...
🌟  Enabled addons: default-storageclass, storage-provisioner
🏄  Done! kubectl is now configured to use "minikube"

$ docker volume ls
DRIVER              VOLUME NAME
local               minikube

$ out/minikube node add
😄  Adding node m02 to cluster minikube
❗  Multi-node clusters are currently experimental and might exhibit unintended behavior.
To track progress on multi-node clusters, see https://github.com/kubernetes/minikube/issues/7538.
👍  Starting node minikube-m02 in cluster minikube
🔥  Creating docker container (CPUs=2, Memory=2200MB) ...
🐳  Preparing Kubernetes v1.18.2 on Docker 19.03.2 ...
🏄  Successfully added m02 to minikube!

$ docker volume ls
DRIVER              VOLUME NAME
local               minikube
local               minikube-m02

$ out/minikube delete
🔥  Deleting "minikube" in docker ...
🔥  Deleting container "minikube" ...
✋  Stopping "minikube-m02" in docker ...
🛑  Powering off "minikube-m02" via SSH ...
🔥  Deleting "minikube-m02" in docker ...
🔥  Removing /Users/selgamal/.minikube/machines/minikube ...
💀  Removed all traces of the "minikube" cluster.

$ docker volume ls
DRIVER              VOLUME NAME
local               minikube-m02