I am using google filestore for persistent volume in kubernetes. But it is mounting only the root folder not its contents.

I am using GKE service and perform the following tasks:

volume-create:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: volume1
spec:
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteMany
  nfs:
    server: x.x.x.x
    path: /share

Persistent volume claim:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: volume1-claim
spec:
  accessModes:
  - ReadWriteMany
  storageClassName: ""
  volumeName: volume1
  resources:
    requests:
      storage: 3Gi

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: image1
spec:
  template:
    metadata:
      labels:
        name: image1
    spec:
      restartPolicy: Always
      volumes:
      - name: volume
        persistentVolumeClaim:
          claimName: volume1-claim
      containers:
      - name: image1
        image: gcr.io/project-gcr/image:1.0
        imagePullPolicy: Always
        volumeMounts:
        - name: volume
          mountPath: "/app/data"

But it mounting empty folder app/data not its contents. I also referred the below URL: https://cloud.google.com/filestore/docs/accessing-fileshares

Any help is appreciated.