Would like to share photo of my Filiformis in dormancy:
It didn't notice how long it took for it to really lose all the leaves, but by the time I noticed, I just had to cut off the dried leaves to get to this stage. Actually the photo was taken maybe 2 to 3 weeks after I left it sitting in shade with minimal watering. Now you can see that new growth is already starting. This is my original plant, there some plants that came from this one and those has also gone dormant too.
TTFN
Arvin