Linux version 4.14.76-19.0.0

How can I get the MTU information for a specific route in this Linux version?

Commands I tried:

• ip route show – This didn’t help, as I couldn’t find the MTU value.
• route -n – This didn’t help either; the MTU value was not displayed.
• cat /proc/net/route – The MTU field was set to zero, even after changing the MTU value.

Can anyone help me retrieve the MTU value for a specific route?
I was able to change the MTU value, and the functionality is working fine.