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The /etc/nsmb.conf file is a plain text file that offers configuration settings for how macOS treats SMB shares. If this file is not present on a system, create it with a text editor. The /etc/nsmb.conf file is divided into sections as outlined on its man page. For these edits, defaults for all SMB shares need to be set. The first line in the file should be [default], followed by the parameters and their values:
[default]
parameter=value
parameter2=value2
parameter3=value3
After updating /etc/nsmb.conf, unmount and remount SMB shares from the macOS system for the changes to take effect.