How to change file permissions after mounting bucket with gcsfuse?

[erkanerol]

We mount our bucket to pods with Cloud Storage FUSE CSI driver as below

  - csi:
      driver: gcsfuse.csi.storage.gke.io
      readOnly: false
      volumeAttributes:
        bucketName: my-bucket
        mountOptions: implicit-dirs,uid=0,gid=0,file-mode=0666,dir-mode=0777
    name: my-storage

I tried to change file permissions of some files in the volume by running `chmod` and `chown` commands. Even though the commands don't fail, the permissions don't change. I think gcsfuse drivers don't allow. Is there a way to do it?

I am aware that I can use `only-dir=` flag to mount some specific folders and change uid and gid in the pod spec but I don't know which directory to mount during pod creation. I have to do it on the fly in the pod. I couldn't find a way to do it.