Add sharedsock example (#1116)

sharedsock/sock_nolinux.go

@@ -8,7 +8,7 @@ import (
 	"runtime"
 )
 
-// Listen is not supported on other platforms
+// Listen is not supported on other platforms then Linux
 func Listen(port int, filter BPFFilter) (net.PacketConn, error) {
 	return nil, fmt.Errorf(fmt.Sprintf("Not supported OS %s. SharedSocket is only supported on Linux", runtime.GOOS))
 }