Synchronization exluding folder

try
{
# Load WinSCP .NET assembly
Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"

# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions
$sessionOptions.Protocol = [WinSCP.Protocol]::Ftp
$sessionOptions.HostName = "HOST"
$sessionOptions.UserName = "USENAME"
$sessionOptions.Password = "PASSWORD"

$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.FileMask = "| ftp_images/manufacturers/type=dir;;sizd=4096;;modify=20131010193915;;UNIX.mode=0775;;UNIX.uid=48;;UNIX.gid=48;;unique=14g1004d1;;/"

$session = New-Object WinSCP.Session
$session.SessionLogPath = "D:\winscp.log" 
 
      try
      {
      # Progress
      $session.add_FileTransferred( { FileTransferred($_) } )
      
      # Connect
      $session.Open($sessionOptions)
      
      #Sync
      $synchronizationResult = $session.SynchronizeDirectories(
            [WinSCP.SynchronizationMode]::Local, $destfilepath, $sourcefilepath, $False, $transferOptions)

      # Throw on any error
        $synchronizationResult.Check()
      
        # Print results
         foreach ($sync in $synchronizationResult.Transfers)
         {
            Write-Host ("Upload of {0} succeeded" -f $sync.FileName)
            Write-Host "============================================"
         }
      }
      finally
      {
        # Disconnect, clean up
        $session.Dispose()
      }
}
catch [Exception]
{
Write-Host $_.Exception.Message
exit 1
}