CentOS is a Linux variant, and therefore shares no code with AT&T Unix System V.
The Linux kernel does support many System V system calls, and as such, a lot of software written for System V was able to be ported over fairly easily. These days, I'd wager that a lot more software is written first for Linux, and then maybe ported to a modern System V derivative like Solaris.
Linux also supports a lot of BSD system calls, by the way. As Unix and Unix-like operating systems go, Linux is the most ecumenical in terms of facilities it supports.
So, Linux is System V if you squint. It is also BSD, and it is also neither.
Linux is Linux.