Here are the benchmarks comparing the GTX 1080 Ti to the new Titan V (Volta Architecture). Note that the V100 is the same chip as the Titan V so it would perform almost exactly the same.
OS: Ubuntu 16.04
Framework(s): Tensorflow 1.4.1, CUDA 9, cuDNN 7
Inceptionv3 (Synthetic Data) in (Images / Sec) 1080 85 1080Ti 136 Titan V 190
VGG19 (Synthetic Data) in (Images / Sec) 1080 63 1080Ti 107 Titan V 147
Essentially between 37% to 40% more throughput on the Titan V compared with the 1080Ti.