Recursively change folder permissions Exchange 2016

$new-user="myusername"
$old-mailbox="old-mailbox"
$folder-name="virus"
ForEach($f in (Get-MailboxFolderStatistics $old-mailbox | Where {$_.FolderPath.Contains($folder-name) -eq $True } ) )
{	
	$fname = $old-mailbox+":" + $f.FolderId;	
	Add-MailboxFolderPermission $fname -User $new-user -AccessRights Owner 
}