Terraform: Mount volume

According to documentation, using terraform, I'm able to create a droplet on digital ocean:

resource "digitalocean_volume" "foobar" {
  region      = "nyc1"
  name        = "baz"
  size        = 100
  description = "an example volume"
}

So, I'm also able to add a volume to it:

resource "digitalocean_droplet" "foobar" {
  name       = "baz"
  size       = "1gb"
  image      = "coreos-stable"
  region     = "nyc1"
  volume_ids = ["${digitalocean_volume.foobar.id}"]
}

I'd like to know how to mount this on a desired location. I need to mount it automatically. I mean, when droplet is up I need to the volume is mounted. I was thinking about using chef...

Any ideas?