Disabling caching in geowebcache.xml using GeoServer?

I need to publish a geometry table (in PostGIS) as a layer of vector tiles (in PBF format) in GeoServer. As the table is dynamically written by a production web app, i need to set the layer's caching as disable. I got a hint that this could be done by editing the geowebcache.xml, specifically with and tags, using the special value -1 (that means no-cache).

What i can not find anywhere is a a real example of configuring this in the geowebcache.xml. The following is my default file (of GeoServer 2.13.2 on Apache Tomcat 8.5):

  xmlns="http://geowebcache.org/schema/1.8.0"
  xsi:schemaLocation="http://geowebcache.org/schema/1.8.0 http://geowebcache.org/schema/1.8.0/geowebcache.xsd">
  1.8.0
  120
  
  
    

    
  

  
    

  

Do i:

1. 
   

   simply put the and out of comment?

   
   


2. 
   

   Or do i need to make a whole block for that specific layer (from , , , , all the way down to ), that specifies and ?