Script for VM HDD type, usage and freespace

Hi All,

I was looking for a script which can give VM's StorageType (Thick or Thin), Usage, available space(in GB)

I got the command given below where i can get storagetype, Capacity, But i need the VM's used and free space also..

get-vm | Get-harddisk | Select-Object  -Property Parent, Name, StorageFormat, CapacityGB

Thanks a ton in advance.