.DS_Store files

Disable creation of .DS_Store files on network volumes:

defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool TRUE

log out and back in to apply changes.

Check current policy:

defaults read com.apple.desktopservices
# Output:
DSDontWriteNetworkStores = 1

To revert the changes, enter:

defaults delete com.apple.desktopservices DSDontWriteNetworkStores