We were discussing Object Storage and file systems.

In a file system we have several layers each contributing to the overall I/O of data. With object storage which can be created using a file-system, we can introduce a layer that traps and translates calls to the filesystem to that on the object storage and back to the file-system without any change in semantics of the application program. The only difference is that the Operating System could help recognize object storage as a first-class citizen just like the file system. 

During the discussion of file system, we talk about NFS file system but not CIFS. This means that we don't export CIFS file system as an object store. Technically there is nothing differentiating one file system from another as long as the file system is exported as an Object Storage. The advantage of CIFS is that it allows file share connectivity on inter-operational operating systems. A file share on Linux now becomes available to use from a Windows machine. Since a file system export works just as well with an object storage, we enable more clients to connect by allowing more forms of exports. 
A bucket is independent of the filesystem since it is an object storage concept. A bucket can be used similar to a filesystem share especially if it is filesystem enabled. This means the users get the convenience of using a file system while they are using an Object Storage. Moreover the user account accessing the bucket can also be setup. 

sudo mount -t nfs -o vers=3,sec=sys,proto=tcp ip.ip.ip.ip:/namespace/my_bucket/ /home/my/share

#codingexercise
Determine if a given large number is divisible by 9

bool isDivisibleBy9(uint n)
{
uint sumOfDigits = 0;
while (n > 0)
{
int digit = n %10;
n = n / 10;
sumOfDigits += digit;
}
return sumOfDigits % 9 == 0;
}