How to stream from the ATV to Sonos?

Hello

I dont have a NAS, and i therefore have all my music on my 160gb ATV. I also use the ATV for streaming video…

I have the Sonos - http://www.sonos.com/products/zoneplayers/s5/default.aspx?rdr=true&LangType=1033 - which i use for streaming my music. I use that together with the ZoneBridge - http://www.sonos.com/products/zonebridge/Default.aspx?rdr=true&LangType=1033.

Is there a way which i can stream the music from the ATV to my Sonos? it works fine when i made a shared folder on my Macbook, but it would be better for me to use the ATV for that. So my question is, can i make a “shared folder” on the ATV, or is there another way to get around this issue?

Thanks