How to skip verification of .dmg file located on a network filesystem?

I have a file server (SMB/Samba 4.5.16) in the local network. If I put a .dmg file on it (anywhere) and try to mount it, MacOs will ALWAYS verify it first, which means reading through the whole thing, which takes almost 30 minutes for a 200GB file over GBit Ethernet. So again, the scenario is: An SMB server exports a share, I mount that normally on the Mac (which works fine), the share contains a .dmg file, I try to mount that, the .dmg file gets verified. Every time. After that, the mount succeeds and I can use the dmg's filesystem without issue, but the 30 minute verification is a total show stopper. I tried the following things, none of which help (all from https://apple.stackexchange.com/questions/370202/how-do-i-skip-verification-of-a-dmg-file) :

# Disable the "Are you sure you want to open this application?" dialog
defaults write com.apple.LaunchServices LSQuarantine -bool false

# Disable Disk Image Verification: Verifying ...
defaults write com.apple.frameworks.diskimages skip-verify -bool true
defaults write com.apple.frameworks.diskimages skip-verify-locked -bool true
defaults write com.apple.frameworks.diskimages skip-verify-remote -bool true

Mounting the thing with hdiutil attach -noverify mounts the filesystem read-only -- useless. This is an M1 Mac running Big Sur. I had an Intel Mac running Catalina before, and I didn't have this problem with that. The file mounted almost instantly (i.e. no verification), from the same file server. If I copy the file to the local disk and mount it from there, it works without verification. How do I fix this? Is anyone doing this successfully, and if so, which file server and MacOs version are you using?