efs should be mounted with nfs options vers=4.1 (https://docs.aws.amazon.com/efs/latest/ug/mounting-fs.html)
efs should be mounted with nfs options vers=4.1 (https://docs.aws.amazon.com/efs/latest/ug/mounting-fs.html)

kubernetes-incubator/external-storage,kubernetes-incubator/external-storage,kubernetes-incubator/external-storage