Execute a command before mounting what's in /etc/fstab - how?

[Chris G]

I have a Freecom network disk which needs the following to be executed
before I can mount it using an entry in /etc/fstab :- 

    echo 0 > /proc/fs/cifs/LinuxExtensionsEnabled

Is there any neat way I can get this command executed during the boot
sequence before the entries in /etc/fstab are mounted?

-- 
Chris Green