Transparency objects (Particle) are hidden behind the global fog

Since the normal Fog is not enough, I have to use the "global fog".

The problem is, I want a snow particle effect, but I's look like objects with transparency shader are hidden by the global fog.

As you can see:

Without the global fog

http://image.noelshack.com/fichiers/2015/37/1442142125-withoutfog.png

With it

http://image.noelshack.com/fichiers/2015/37/1442142122-withfog.png

I'm on it since 4 hours....

 

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Having the same issue with the default unity tree leaf and billboard shader which are also transparent.