Unable to access Linux share from a Windows machine with NT_STATUS_BAD_NETWORK_NAME error

Question

On the Linux machine I changed the smb.conf like this:

[john]
path = /root/john/downloads
available = yes
valid users = john
read only = no
browsable = yes
public = yes
writable = yes

The path /root/john/downloads is mounted like this:

mount -o umask=0000,gid=1001,uid=1001 /dev/sdb1 /root/john/downloads

where gid and uid are john.

Now when I try to access the share with the Windows machine \\192.168.0.2\john I get the error network path was not found with Wireshark I saw it's the NT_STATUS_BAD_NETWORK_NAME error. What is wrong with this, why isn't it working?

When I choose /home/john as the path it works perfectly.