message: docs: containerd configuration version 2 setting
  add containerd configuration version 2 setting
  in containerd-env.setup.md
diff: @@ -79,19 +79,34 @@ Nydus uses two features of containerd:
  - remote snapshotter
  - snapshotter annotations
  -To set them up, add something like the following to your `containerd` configuration (default to `/etc/containerd/config.toml`):
  +To set them up, first add something like the following to your `containerd` configuration (default to `/etc/containerd/config.toml`):
  ```toml
  [proxy_plugins]
  [proxy_plugins.nydus]
  type = "snapshot"
  address = "/run/containerd/containerd-nydus-grpc.sock"
  +```
  +
  +Next you should change default snapshotter to `nydus` and enable snapshot annotations like below:
  +
  +For version 1 containerd config format:
  +
  +```toml
  [plugins.cri]
  [plugins.cri.containerd]
  snapshotter = "nydus"
  disable_snapshot_annotations = false
  ```
  +For version 2 containerd config format:
  +
  +```toml
  +[plugins."io.containerd.grpc.v1.cri".containerd]
  + snapshotter = "nydus"
  + disable_snapshot_annotations = false
  +```
  +
  Then restart containerd, e.g.:
  ```bash
  