where to find the folder "/driver/net/"? I am trying to build an adhoc network using Samsung Galaxy S4. 

Having established the network on the first handset, I am trying to connect another SGS4 to the same network. 

The second SGS4 seems to discover the network and connect to it, however it generates, locally, a different network MAC address (BSSID) and hence can't actually connect to the same network, though it is connected to the same SSID (network-name).

In order to set a fixed BSSID in the second SGS4 I need to change some flags on the wireless-driver which usually is located in /driver/net/wireless/. Nonetheless, looking around, I can't find this folder in my rooted Samsung Galaxy S4. I've searched almost everywhere but can't find it.

If there is any other way to set a fixed BSSID, I'm of course open to that as well.
The discussion you've been reading is about compiling a modified kernel and a custom ROM for the Galaxy S4, using a replacement wireless driver that's been changed to add support for ad-hoc Wi-Fi networks. The path /driver/net/wireless is a path in the kernel source tree, which contains the source code for the driver that needs to be changed before compiling the new kernel. It doesn't refer to any path on the device itself, or anything else you can change on the device.