See https://www.gimp.org/release-notes/gimp-2.10.html/
"High bit depth support allows processing images with up to 32-bit per color channel precision and open/export PSD, TIFF, PNG, EXR, and RGBE files in their native fidelity. Additionally, FITS images can be opened with up to 64-bit per channel precision."
I just imported a 16-bit grayscale Photoshop file and GIMP retained the embedded 16-bit Adobe Gamma 2.2 Grayscale profile.
I haven't tested more than that. I am wondering if the output TIF file is suitable for input to Quadtone RIP for Piezography.
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